Hi,
This page: http://onlineinformatie.nl/keukens/ has its own menu item so you can assign modules to this page.
However, the sub page: http://onlineinformatie.nl/keukens/inrichting-indeling/ doesn’t belong to any menu item, so the layout of this page will inherit the ‘Sub-layout’ settings in template style ‘JA Teline V – Magazine’: http://prntscr.com/ef4ojj
If you want this sub page has exactly same layout with ‘Keukens’ page, you will need to create a new menu item for ‘Keuken inrichting & Indeling’ category. Then assign modules you want to this new page. All configuration will be the same as you created ‘Keukens’ page.
Regards